CREW

CREW Carbon is a Brooklyn, New York-based climate technology and process intensification company that provides calcium carbonate dosing systems for wastewater treatment facilities, replacing conventional hazardous chemicals like sodium hydroxide while simultaneously generating verified carbon dioxide removal (CDR) credits. The company's core technology integrates directly into existing biological wastewater treatment processes, using naturally sourced calcium carbonate minerals to optimize alkalinity, improve nutrient removal performance, enhance sludge settleability, and reduce process emissions. CREW operates a dual revenue model: wastewater operators benefit from improved treatment performance, regulatory compliance, and compounding opex savings on chemicals and dewatering polymers, while carbon removal buyers purchase verified Wastewater Alkalinity Enhancement (WAE) credits measured through closed-system inlet/outlet monitoring. Deployments include Hampton Roads Sanitation District in Virginia at a 10 MGD enhanced biological phosphorus removal facility — where CREW helped defer a planned $350 million tertiary treatment plant by consistently meeting stringent nitrogen and phosphorus limits — and a 25 MGD high-purity oxygen facility in the Northeast U.S. that reduced SVI by 50–70% and eliminated TSS excursions during wet weather events. CREW has delivered verified WAE carbon credits to Frontier buyers under a $32.1M offtake agreement, with additional buyers including Google, Salesforce, and H&M Group. Research partners include Yale, Georgia Tech, Texas A&M, and Pacific Northwest National Laboratory.